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Finding the Fourth Proportional to 37.90, 56.76 and 31.14

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Solution

The fourth proportional to 37.90, 56.76 and 31.14 is: 46.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.90 : 56.76 = 31.14 : x
  2. Step 2: Convert to fraction form
    37.90/56.76 = 31.14/x
  3. Step 3: Cross multiply
    37.90x = 56.76 × 31.14
  4. Step 4: Simplify right side
    37.90x = 1,767.51
  5. Step 5: Solve for x
    x = 1,767.51/37.90
  6. Step 6: Final answer
    x = 46.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.